添加新题目

子串/和为K的子数组/main.go

@@ -0,0 +1,40 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println(subarraySum([]int{1, 2, 1, 2, 1}, 3))
+}
+
+func subarraySum(nums []int, k int) int {
+	result := 0
+	hash := make(map[int]int)
+	value := 0
+	hash[0] = 1
+	for i := range nums {
+		value += nums[i]
+		if v, ok := hash[value-k]; ok {
+			result += v
+		}
+		hash[value]++
+	}
+
+	return result
+}
+
+//func subarraySum(nums []int, k int) int {
+//	slow := 0
+//	result := 0
+//	for slow < len(nums) {
+//		value := 0
+//		fmt.Println("1")
+//		for fast := slow; fast < len(nums); fast++ {
+//			value += nums[fast]
+//			if value == k {
+//				result += 1
+//			}
+//		}
+//		slow++
+//	}
+//	return result
+//}